# Combining Document Classes

I have a complicated document containing files with a letter as the first document followed by several article type documents. I have done this by setting up a master tex file with all the frontpeice information, defining common style elements and whatnot, then adding the documents with \include statements. Is there a way to use the letter document class for the first file then switch to the article class for the rest of the files?

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This FAQ answer discusses some solutions to this type of problem. The only one that I think is likely to work for you in this case, is the pdfpages based solution.
Late to the party, but the combine document class might do what you want. Unfortunately, it also tends to conflict with a lot of things, so YMMV.
I don't believe there is going to be an easy way to do what you want. You could move all of the "common style elements" into a a .sty file that you can then use via \usepackage from your other documents.